MCIWNDM_OPEN

The MCIWNDM_OPEN message opens an MCI device and associates it with an MCIWnd
window. For MCI devices that use data files, this macro can also open a
specified data file, name a new file to be created, or display a dialog box to let the
user select a file to open. You can send this message explicitly or by using
the MCIWndOpen macro.

MCIWNDM_OPEN

wParam = (WPARAM) (UINT) wFlags;

lParam = (LPARAM) (LPVOID) szFile;

Parameters

wFlags

Flags associated with the device or file to open. The MCIWNDOPENF_NEW flag
specifies a new file is to be created with the name specified in szFile.

szFile

Address of a null-terminated string identifying the filename or MCI device
name to open. Specify 1 for this parameter to display the Open dialog box.